Circuit for timing devices



April 1951 w. c. KLAMMER 2,548,028

CIRCUIT FOR TIMING DEVICES Filed Sept. 24, 1949 Patented Apr. 10, 1951 CIRCUIT FOR TIIVIING DEVICE S William C. Klammer, Mankato, ,Minn., assignor to Automatic Electric Manufacturing company, Mankato,1Minn., a corporation .of Minnesota Application September 24, 1949, Serial'No. 117,705

2 Claims. 1 My invention relates generally to circuits for timing devices and, more specifically, to a circuit for a timing device located remote from a power-operated mechanism controlled thereby.

Heretofore, it has been common practice to 5 switch when it is desired to shut 01f the motor extend a separate lead from the power source 6. In this case, it is sometimes desirable to to the timer mechanism and a return wire to couple a motor-driven timing switch to the cirone side of the existin manually-operated concuit so that the operator may close the cirtrol switch, whereby the power-operated mechcuit to the motor 6 for a pre-selected period of anism and the timin mechanism are in paraltime, the circuit being automatically reopened lel arrangement. When applying a timer switch when said predetermined time interval has to an old installation, it is sometimes very difelapsed. A normally open timer switch 1 is ficult and expensive to properly install the above closed and permitted to open by a cam 8 sementioned lead. The primary object of my incured to a rotary shaft 9. The shaft 9 is coupled vention is, therefore, the provision of a circuit to an elect ic tim r mot r In a iS provided for timing devices remotely situated from the with a manually-operated setting knob ll. As device to be controlled, wherein a minimum of shown, the motor I0 is coupled to the secondary wiring is necessary. winding of a transformer l2, by leads [3 and Another object of my invention is the provi- I4. The primary winding of the transformer sion of a circuit, as set forth, which will permit I2 has one end connected to one side of the location of the timing switch and operating control switch 4 by a lead I5, the other end hemechanism therefor wherever desired remote in connected to one side of the timer switch from the device to be controlled. 7 by a lead [6. The opposite side of the switch still another object of my invention i the l is connected to the opposite side of the switch provision of a circuit, as set forth, which will 4 y a lead The timing mechanism i cl dpermit installation of a timing mechanism to an ing the switch 1, cam 8, 01 ee existing circuit without disturbing the existing k ob l I and the transformer 12 are preferably wiring in said circuit. housed within a casing, shown by broken lines Other highly important objects and advantages and indicated by I8. The elements contained of my invention will become apparent from the wi hin the a in '8 r nv n ion l imin pfollowing detail specification, appended claims, paratus and do not in themselves comprise the and attached drawing. invention.

Referring to the drawin the single view is Heretofore, it has been customary to operate a Wiring diagram of my nove1circuit, the timer motor H) from an entirely separate With reference in greater detail to the drawcircuit from that including the motor s ing, a source of electrical power is shown as practice involved the running of a separate lead being in the nature of a power line comprising leads from the D lines I n 2 o the wires l and 2. A power lead 3 is connected at time! motor I have Overcome this j one end t th power li wire and t t tionable feature by connecting the timer switch 1 opposite n t one i of a manually-operat- 40 and the timer motor 10 in series with the powered control it 4 A return lead 5 has one driven motor 6. It should be obvious from the end connected to the opposite side of the conve that in connecting the leads l5 and IT to trol switch 4 and its other end secured to the the opposite d s or terminals f t e swi h power h Wire 2 An electrically powered that installation of the timing device is accomvi i interposed in t return lead 5 and i plished and no disturbance of the existing circuit shown as comprising a motor 6 which may be through the motor 6 is necessary. It should be assumed to perform any suitable function, such noted that the timer switch 1 and the primary as the d ivin of a Ventilating fan r the like, coil of the transformer l2 for operating the motor not shown. In this instance, it may be assumed '0 re in s r s Wi h the p w p mot r that the motor 6 is located remote from the 6, but in parallel with the manually-operated switch 4 and at a point where access thereto is control switch 4. This arrangement provides for gained at considerable inconvenience to the op independent control of the motor 6 by either the erator. The switch 4, however, is situated at a manually-operated switch 4 or the cam-operated point where it may be easily reached. timer switch 1. It should be further noted that It is frequently desired to operate the motor when the motor 6 is controlled by the timer 2 6 for a predetermined length of time, after which the control switch 4 is opened to break the circuit to the motor 6. This arrangement necessitates the presence of the operator at the switch 1, the manually-operated control switch 4 must be open.

While I have shown a commercial embodiment of the invention, it will be understood that the same is capable of modification without departure from the spirit and scope of the invention as defined in the claims.

What I claim is:

1. A circuit for an electrically powered device, said circuit comprising a power supply lead and a return lead, said leads being adapted to be coupled to a source of electrical energy said device being interposed in one of said leads, a manuallyoperated control switch connecting said leads remote from said device, a manually closed poweropened timer switch, and an electric motor for opening said timer switch, said motor and timer switch being connected in series across the contacts of said manually operated control switch.

2. In a circuit for controlling an electrically powered device, means for connecting said device to a source of electrical energy, said means in- 4 eluding a manually closed power opened timer switch and an electric motor for said timer switch, said switch, motor, and electrically powered device being connected in series, and a manually operated control switch in series with said power operated device and in parallel with said timer switch and said motor, whereby said timer switch and motor may be shunted out of controlling relationship with said device, said timer switch and motor being remote from the electrically powered device.

WILLIAM C. KLAMMER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

